According to many he’s been dead since then, and his heir has just been trying to keep it all hidden because SK’s inheritance taxes could threaten the family’s majority stake in the business.
In the UK if you get a (sizeable, asset) gift from someone and they die within a certain number of years you then need to pay inheritance tax on it. Could be the same mechanism here? Date has passed so turn off the ventilator or whatever?
Regardless of what you think of the conspiracy theory, they've had quite a long time to plan what they do next, so you'd presume they had something figured out.